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[S390] cpu topology: introduce kernel parameter

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Introduce a topology=[on|off] kernel parameter which allows to switch
cpu topology on/off. Default will be off, since it looks like that for
some workloards this doesn't behave very well (on s390).

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
2008-12-25 13:39:23 +01:00
committed by Martin Schwidefsky
parent 9fee8db222
commit 2b1a61f0a8
2 changed files with 19 additions and 1 deletions
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12
arch/s390/kernel/topology.c
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@@ -58,6 +58,7 @@ struct core_info {
cpumask_t mask;
};
static int topology_enabled;
static void topology_work_fn(struct work_struct *work);
static struct tl_info *tl_info;
static struct core_info core_info;
@@ -78,7 +79,7 @@ cpumask_t cpu_coregroup_map(unsigned int cpu)
cpumask_t mask;
cpus_clear(mask);
if (!machine_has_topology)
if (!topology_enabled || !machine_has_topology)
return cpu_possible_map;
spin_lock_irqsave(&topology_lock, flags);
while (core) {
@@ -263,6 +264,15 @@ static void topology_interrupt(__u16 code)
schedule_work(&topology_work);
}
static int __init early_parse_topology(char *p)
{
if (strncmp(p, "on", 2))
return 0;
topology_enabled = 1;
return 0;
}
early_param("topology", early_parse_topology);
static int __init init_topology_update(void)
{
int rc;